1. Department of Rheumatology, Tokyo Metropolitan Geriatric Hospital, Tokyo, Japan;
2. Department of Rheumatology, Nissan Tamagawa Hospital, Tokyo, Japan;
3. Section of Bacteriology, Department of Clinical Laboratory, Tokyo Metropolitan Geriatric Hospital, Tokyo, Japan;
4. Department of Infectious Diseases, Tokyo Metropolitan Geriatric Hospital, Tokyo, Japan;
5. Department of Clinical Laboratory, Tokyo Metropolitan Geriatric Hospital, Tokyo, Japan;
6. Department of Infectious Diseases, Tokyo Women’s Medical University, Tokyo, Japan;
7. Department of Lifetime Clinical Immunology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan;
8. Department of Rheumatology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan